Home›Speed›MPH to KM/H
Speed

MPH to KM/H

Convert mph to km/h quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.

ADVERTISEMENT
CONVERTED RESULT—
Decimal places
CONVERSION RULE

1 mph equals approximately 1.60934 km/h.

How to use the MPH to KM/H

  1. Enter the number you want to convert.
  2. Confirm the source unit shown beside the input.
  3. Choose decimal precision if you need more or less detail.
  4. Read the converted result.
  5. Copy the result when you need to use it elsewhere.

How the conversion works

1 mph equals approximately 1.60934 km/h.

For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.

ADVERTISEMENT

Common mph to km/h conversions

mphkm/h
1 mph1.609344 km/h
2 mph3.218688 km/h
5 mph8.04672 km/h
10 mph16.09344 km/h
20 mph32.18688 km/h
50 mph80.4672 km/h

Example

For example, entering 1 mph gives approximately 1.609344 km/h using the rule above. Change the input to test your own value.

Frequently asked questions

The MPH to KM/H converts a value from mph to km/h using the conversion relationship described on this page.
Enter your value, review the source and destination units, choose the decimal precision and read or copy the result.
1 mph equals approximately 1.60934 km/h.
Use enough precision for your purpose. Everyday estimates usually need fewer decimal places; technical work may require more.
It can be a useful reference calculation, but safety-critical, regulated, contractual or specialized work should be verified against the applicable authoritative standard.

Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.

Page reviewed: August 24, 2026.